Approximately 4.1819 Joules (SI). The amount of energy required to raise the temperature of 1 gram (g) of water (without air) from 19.5 °C to 20.5 °C.

1 British Thermal Unit (mean):

Approximately 1.05587x103 Joules (SI). The mean energy required to raise the temperature of 1lb of water 1°F for the range of temperatures where water is liquid. See BTUIT (international table) for common BTU.

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